@BojackHorseman You should do some inner work. It's probably due to some bad experiences in the past which cause you to dislike interacting with people, dislike taking on issues and preferring to stay at home and relax. You also need to break out of your comfort zone by taking on more tasks and activities. Your ambition will then build from there.

8 years ago being courageous was not a trade associated with me.
When I asked people around me what my top 5 strengths are last year, courage was part of everyone’s list.
Reflecting on my growth process, I would say it was a rather gradual one.
As Nathaniel Daniel describes, self-esteem is a reciprocal trade. When we have more self-esteem, we act like it. When we act like it, we grow in self-esteem.
my advice would be to deliberately start taking small courageous steps outside of your comfort zone.
Pick-up can be great for this. I did door-to-door sales which helped. Starting your own business. Talking to strangers. Posting something online. Expressing your boundaries. The list is endless.
Brain Begin from Fearless has this technique called smth like the ‘tension journal’. Where he would note down throughout the day which actions he could take and which degree of tension they would be. 1 being completely comfort zone. 10 being completely out. Then he would challenge himself to do actions in the 4-7 range to train his courage.
In the end, what I’m saying is that courage, bravery and decisiveness can be seen as a skill. Train it deliberately and you will grow.
 

This is the essence of shadow work; become aware of someplace in your mind where you're judging yourself or holding yourself back and cease to do so.

I'm also a beginner to this. I would assume that eventually in order to fully integrate all aspects of you and your entire past is to give Love consciously and specifically to those parts that you don't like about yourself. I guess visualizing this is a way to go.
I remember Leo actually has a video about a similar technique. First you think of anything that you love with all your heart (doesn't matter if its a person or a movie or an activity or whatever). Then you visualize this feeling in front of you like a ball of light. And then bring in mind the shadow you want to integrate (a part of yourself or a memory of a specific situation) and consciously give it the Love.
Try to have empathy and understand for this part of you and realize that it is okay to have that part. If it's a memory of the past, realize that in that situation you tried to do the best you could, given to the circumstances. Overcome the need to judge the shadow.
Maybe there are better techniques than this, but usually Love is the ultimate way to heal your shadows.

Talked about this at length with my good friend D yesterday.
Death, and accepting that one is going to die soon or soon-ish, is a great tool to clarify what's important, to live and spend time more intentionally, and it works well against procrastination.
But the interpretation is still completely subjective and relative to values.
He used the "memento mori" when he was in a situation where he's dating a beautiful woman who really turns him on, but who has a stalker.
For him, he's going to die someday anyway, so with the very low risk that this stalker would actually hurt him, he decided he wants to experience this woman. He values turn-on, beauty and adventure.
For me, the same "memento mori" would make me do the opposite: I would quickly move away from the situation because I value deep healthy connection, and chances are that when there's a drama like that, both parties are at a comparable level of emotional maturity, which would get in the way of a healthy connection.
For some, knowing one is dying soon-ish would mean to work more and get more done.
For others, to work less and enjoy more.
Either way, it furthers intentionality, and that is beautiful.